TWENTY-SECOND ANNUAL MEETING. 



47 



slit or line opening by the spreading apart of two lips, the excreta being ejected as 

 a small pellet. Little observation of the young of the Mallophaga seems to have 

 been made. The nymphs are very light colored, unchitinized specimens, and ex- 



^ STIGMA 



TETROPTHALMUS.— Showing respiratory system 

 a. Longitudinal tracheal trunlc. 6. Transverse tracheal trunk. 



hibit large, unwieldy heads. From the notes on over fifty specimens measured, it 

 may be said that the Mallophaga vary in length from less than one millimeter to 

 five millimeters. In the following scheme of Nitzsch the points added by the writer 

 are printed in italics. The table is slightly rearranged: 



THE MALLOPHAGA. 



With one (1) clawed feet — found only on mammals. 



With thread-like antennae — three jointed; no maxillary 



palpi Trichodectes. 



With club-shaped antenn® — four jointed; with maxillary 



palpi Gyropus. 



With two (2) clawed feet — found only on birds. 



